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I have owned it for 4 years with no problems. This model has 100 individual power supply filtering capacitors in lieu of two large 22,000 mfd versions, which makes its response quicker(MK2 feature). There are two grommets in the rear panel which were used to connect additional external capacitors, but there was no audible difference, proving the effectiveness of the MK2's bank of 100. For economic reasons I am downsizing from bridged Musician 3s on each of four woofers and two compression drivers to single, bridged modified non-MK2 Musician 3s with external capacitor banks (doubling the MK2 capacitance) to drive parallel pairs of woofers for my JBL M9500s. I have replaced JBL's external passive crossovers with Dolby Lake/Lab Gruppen electronic speaker controllers to eq the room and time align all drivers. I received comments for countless auditioners who have never heard anything better in their lives. The 10x quicker internal feedback from John Ulrick's design is a major contributing factor. There are internal switches to select 120 or 240 VAC power and toggle switches on the back panel to select RCA or XLR inputs. Idling current is around 40 watts which leaves the unit only slightly warm to touch. Cool temperatures greatly extend component life by a factor of two for each 19 degrees F (10 degrees C) which implies about 3x longer life than conventional amplifiers. Please leave a phone number or drop an email if you have questions.